Scriptaculous Sortable Uses 100% CPU and very slow

Using script.aculo.us sortable.create to allow user to move words
around- is there a way I can speed things up? it is jitterry and slow
even with good spec computer and only six items:


In head:
<script src="scriptac/prototype.js" type="text/javascript"></script>
<script src="scriptac/scriptaculous.js" type="text/javascript"></
script>

Defined in body as as

<div id="DragAgentsDiv" class="sortableList" Style="z-index: 1; left:
22px; position: absolute; top: 408px; cursor:move">
:
<FONT id="DragAgent_4" color="olive" face="Comic Sans MS" size="5":
</div>

called using:
<script type="text/javascript">
Sortable.create('DragAgentsDiv',{tag:'FONT', overlap:'horizontal',
constraint:false});
</script>